SM Entertainment gave an explanation on the absence of Jaemin in NCT Dream's comeback. 

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The official statement is posted on NCT SMTOWN's webpage. The announcement reads:

"Hello. This is SM Entertainment. 

We appreciate all the fans for the great attention on the teaser images of NCT Dream's first single album 'The First' that were revealed today. We're here to make an announcement for the fans who've waited for Jaemin.

Last year, Jaemin, who joined promotions for 'Chewing Gum', has been treated for a herniated disc since his trainee days. His condition has worsened and because we believe that artist's health is first priority and most important, we decided for him to focus on treatment and take a break for this promotions. 

We ask fans to understand and give many support and encouragement for his fast recovery. 

Once again, we appreciate all the fans who support NCT Dream. NCT Dream will work their best to repay the love.

Thank you."